Most of the time, couples want everything to line up perfectly, and we understand that.  But more and more often, the bride doesn't have to have everything looking the same.  She might like one style for her engagement ring and another style for the wedding band.  In this case, the bride wanted a matched pair of diamond eternity rings that would compliment her engagement rings, but also beautiful all on their own, when she didn't feel like she wanted to wear her engagment ring.